CN102281239B - Anti-interference multimedia mobile broadcast signal framing modulation method - Google Patents
Anti-interference multimedia mobile broadcast signal framing modulation method Download PDFInfo
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Abstract
The invention discloses an anti-interference multimedia mobile broadcast signal framing modulation method, and belongs to a time domain and frequency domain mixed framing modulation scheme. The anti-interference multimedia mobile broadcast signal framing modulation method has the advantages of low peak-to-average power ratio, short synchronous time, interference resistance, controllable multi-service and the like.
Description
Technical field
The invention belongs to moving communicating field, relate more specifically to a kind of anti-interference multimedia mobile broadcast signal framing modulation method.
Background technology
Digital television broadcasting correlation technique and related industry thereof are that in Communications And Computer field, development is very fast, the industry of good market prospect.In digital television broadcasting correlation technique, the emphasis that various countries pay close attention to is at present that the digital television broadcasting how to pass under environment for complex wave provides the implementation of reliable high-speed mobile cheaply.Framing modulation technique is the key technology of digital television broadcasting system, for whole system performance, plays conclusive effect, is the object of everybody primary study.
Due to the develop rapidly of Digital Signal Processing and integrated circuit technique, the system of OFDM (OFDM) technology realizes and becomes more and more easier.Because OFDM Multicarrier Transmission Technology has simple in structure, the availability of frequency spectrum is high, the plurality of advantages such as in the time of can resisting frequency selectivity and channel, becomes and extremely everybody concern obtain deep research and the extensive use in the numerous areas such as Xdsl, wide-band mobile communication, broadband mobile local area network (LAN), digital television broadcasting.
The peak-to-average power ratio that ofdm signal is higher (PAPR) has very high requirement to the range of linearity of amplifier and digital to analog converter, if system linearity scope can not meet the variation of signal, can cause signal distortion, signal spectrum is changed, thereby cause the orthogonality between subchannel to be destroyed, produce phase mutual interference, make system performance degradation.Therefore the solution that, must consider how to reduce the probability of occurrence of large peak power signal in ofdm signal and reduce nonlinear distortion impact.
Under multidiameter fading channel, can be by coding, interweave and the cascade optimal design of modulation scheme reaches large as far as possible signal diversifying exponent number, to obtain independent decline in equaling or exceeding the symbol sebolic addressing of minimum free distance.The different coding form of cascade can make full use of the advantage of different coding technology; Between coding and code element modulation, insert bit interleaver, can so that coding and modulated process is relatively independent and from different multi-system symbolic numbers, expand diversity order to different binary bits number, thereby the bit error performance that diversity order is improved significantly and has had under multidiameter fading channel.
In practical communication environment, digital TV multimedia mobile broadcast communication system performance is subject to the impact of the factors such as lock in time, clock jitter, channel fading, channel disturbance.Multimedia Mobile broadcast signal transmission machine framing modulator approach is to realize the key technology of the anti-interference Multimedia Mobile broadcast of reliable digit TV.
Utilizing digital TV multimedia mobile broadcast transmission system to provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service is the embodiment that the anti-interference Multimedia Mobile broadcast transmission system of new-generation digital TV satisfies social needs.
Based on above background, the present invention is directed to practical communication environment and propose a kind of anti-interference multimedia mobile broadcast signal framing modulation method just, can meet the needs that High Data Rate can be controlled the anti-interference Multimedia Mobile broadcasting transmitting of multi-service Digital Television.
Wish is done more deep understanding to patent background can be with reference to following documents and materials:
R.V.Nee，R.Prasad.“OFDM?for?wireless?multimedia?communications”.Boston：Artech?House，2000.
Y.Wu，S.Hirakawa，U.H.Reimers，and?J.Whitaker.“Overview?of?digital?television?development，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.8-21，Jan.2006.
U.Ladebusch?and?C.A.Liss.“Terrestrial?DVB(DVB-T)：A?broadcast?technologyfor?stationary?portable?and?mobile?use，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.183-194，Jan.2006.
M.Takada?and?M.Saito.“Transmission?systems?for?ISDB-T，”Proceedings?of?the?IEEE，Special?Issue?on?Global?Digital?Television：Technology?and?Emerging?Services，pp.251-256，Jan.2006.
G.Caire，G.Taricco，E.Biglieri，“Bit-interleaved?coded?modulation，”IEEE?Trans.Information?Theory，vol.44，no.3，pp.927-946，May?1998.
S.Benedetto，D.Divsalar，G.Montorsi，and?F.Pollara，“Serial?concatenation?of?interleaved?codes：performance?analysis，design，and?iterative?decoding，”IEEE?Trans.Inform.Theory，vol.44，no.3，pp.909-925，May?1998.
Summary of the invention
The present invention is directed to High Data Rate and can control the anti-interference Multimedia Mobile broadcast issue of multi-service Digital Television, proposed a kind of anti-interference multimedia mobile broadcast signal framing modulation method.
A kind of anti-interference multimedia mobile broadcast signal framing modulation method that the present invention proposes, is characterized in that it comprises the following steps:
1) anti-interference Multimedia Mobile broadcast signal transmission machine is by the input data bit of oneself the RS coding (Reed-Solomon that flows through, RS), convolutional interleave, serially concatenated multi code Rate of Chinese character form the cascade interweaved coding modulation data piece of FFT after deleting remaining convolutional encoding, code element modulation and code element rotation, symbol interleave on frequency domain, FFT represents fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) anti-interference Multimedia Mobile broadcast signal transmission machine adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total, IFFT represents fast discrete Fourier inverse transformation;
3) anti-interference Multimedia Mobile broadcast signal transmission machine is divided equally into two by the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1with the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
total=[D
1, D
2];
4) anti-interference Multimedia Mobile broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
new=[D
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the 12 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* 1expression is to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1the cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
5) the real part sequence of anti-interference Multimedia Mobile broadcast signal transmission machine using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference Multimedia Mobile broadcast signal transmission machine;
6) anti-interference Multimedia Mobile broadcast signal transmission machine repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block;
7) anti-interference Multimedia Mobile broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
8) anti-interference Multimedia Mobile broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) anti-interference Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) anti-interference Multimedia Mobile broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
Anti-interference multimedia mobile broadcast signal framing modulation method according to above-mentioned, is characterized in that: the falling that the signal that the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece undertakies by specific 12 kinds of generate patterns by the cascade interweaved coding modulation data sample value of time domain discrete sub-block adds, subtracts, conjugate operation is processed of anti-interference Multimedia Mobile broadcast signal transmission machine and again synthetic; In the signal frame of anti-interference Multimedia Mobile broadcast signal transmission machine, there is periodic time domain and embed training sequence discrete sample block; The length X of the training sequence of anti-interference Multimedia Mobile broadcast signal transmission machine is in 512,1024,2048, the length K of the cascade interweaved coding modulation data piece of corresponding FFT is respectively 2048,4096,8192, the frequency interval of corresponding subcarrier is respectively 4KHz, 2KHz, 1KHz, and corresponding circulating prefix-length C is respectively 1/4,1/8,1/16 of the cascade interweaved coding modulation data block length of FFT K size; The training sequence of anti-interference Multimedia Mobile broadcast signal transmission machine, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics; Training sequence, the operational indicator sequence of anti-interference Multimedia Mobile broadcast signal transmission machine have orthogonality each other; Each different operational indicator sequence of anti-interference Multimedia Mobile broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing anti-interference Multimedia Mobile broadcast signal transmission machine; Serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding and is formed more than being deleted by random interleaving serially concatenated by two convolutional encodings, and the encoding rate that serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
Feature of the present invention:
The present invention is the framing modulation scheme that a kind of time-domain and frequency-domain mixes.Generate pattern of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece of the present invention and there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece choosing method falls, but the very high large peak power signal probability of the maximum peak power that not only can make full use of ofdm signal is very low, the real part of the ofdm signal when number of sub carrier wave is larger (or imaginary part) is the characteristic of multiple Gaussian random process and whose amplitude obeys Rayleigh distribution, the amount of information of the required extra transmission of generate pattern adopting is little, be easy to process at receiver end the primary signal of recovering to obtain ofdm signal, the orthogonal property that can not destroy sub-carrier signal simultaneously can not produce extra nonlinear distortion yet.In the signal frame of anti-interference Multimedia Mobile broadcast signal transmission machine, there is periodic time domain and embed training sequence discrete sample block, the training sequence of anti-interference Multimedia Mobile broadcast signal transmission machine, operational indicator sequence has pseudo-random characteristics, the training sequence of anti-interference Multimedia Mobile broadcast signal transmission machine, operational indicator sequence has orthogonality each other, it is by falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece that the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls in the time domain embedding training sequence of anti-interference Multimedia Mobile broadcast signal transmission machine, time domain embeds training sequence discrete sample block and directly superposes and form, these have guaranteed that anti-interference Multimedia Mobile broadcast signal receiver can realize frame synchronization fast and accurately, Frequency Synchronization, time synchronized, channel transfer characteristic is estimated, and phase noise and channel transfer characteristic are reliably followed the tracks of.Using Cyclic Prefix as protection interval, insert time domain embedding training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece to form signal frame, can reduce the interference effect between adjacent signals frame.Input data are carried out to cascade interweaved coded modulation and improved diversity order, the bit error performance that communication system has been had under multidiameter fading channel.Code element modulation rotates with code element the diversity that mobile multimedia broadcast signal is provided.Each different operational indicator sequence of anti-interference Multimedia Mobile broadcast signal transmission machine is comprising and unique each system parameters and business model information of expressing anti-interference Multimedia Mobile broadcast signal transmission machine, can, so that the anti-interference Multimedia Mobile broadcast transmission system of Digital Television can provide free television broadcasting, paid television broadcasting, Secret Information Transmission, multimedia value-added service etc. can control multi-service, satisfy social needs.Framing modulator approach of the present invention has low peak-to-average power ratio, lock in time is short, clock jitter is little, anti-channel fading, anti-channel disturbance, can provide high cascade interweaving encoding modulation data rate can control the plurality of advantages such as the anti-interference Multimedia Mobile broadcasting transmitting of multi-service Digital Television.
Accompanying drawing explanation
Fig. 1 is the embodiment schematic diagram according to certain transmitter of anti-interference multimedia mobile broadcast signal framing modulation method of the present invention.
Fig. 2 is according to the embodiment schematic diagram of certain transmitter signal framing modulation of anti-interference multimedia mobile broadcast signal framing modulation method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
The embodiment of certain transmitter of the anti-interference multimedia mobile broadcast signal framing modulation method proposing according to the present invention, as shown in Figure 1, follows these steps to carry out:
1) this certain anti-interference Multimedia Mobile broadcast signal transmission machine is flowed through the input data bit of oneself after RS coding, convolutional interleave, serially concatenated multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, FFT represents fast discrete Fourier conversion, and the length of the cascade interweaved coding modulation data piece of FFT is K; Serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding and is formed more than being deleted by random interleaving serially concatenated by two convolutional encodings, and the encoding rate that serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
2) this certain anti-interference Multimedia Mobile broadcast signal transmission machine adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total, IFFT represents fast discrete Fourier inverse transformation;
3) this certain anti-interference Multimedia Mobile broadcast signal transmission machine is divided equally into two by the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1with the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
total=[D
1, D
2];
4) this certain anti-interference Multimedia Mobile broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
1, D
2], generate pattern 2 is
Generate pattern 3 is
Generate pattern 4 is
Generate pattern 5 is
Generate pattern 6 is
Generate pattern 7 is D
new=[D
* 1, D
2], generate pattern 8 is
Generate pattern 9 is
Generate pattern 10 is
Generate pattern 11 is
Generate pattern 12 is
Compare the 12 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* 1expression is to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1the cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
5) the real part sequence of this certain anti-interference Multimedia Mobile broadcast signal transmission machine using training sequence as sequence of plural training, imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, training sequence, operational indicator sequence, the length of the discrete sample block of sequence of plural training is all X, operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference Multimedia Mobile broadcast signal transmission machine, X gets 512, 1024, in 2048 one,
6) this certain anti-interference Multimedia Mobile broadcast signal transmission machine repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block; When X gets 512, K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X gets 1024, K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X gets 2048, K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz;
7) this certain anti-interference Multimedia Mobile broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
8) this certain anti-interference Multimedia Mobile broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C; When X gets 512, C gets 1/4 of K size; When X gets 1024, C gets 1/8 of K size; When X gets 2048, C gets 1/16 of K size;
9) this certain anti-interference Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) this certain anti-interference Multimedia Mobile broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
Embodiment according to certain transmitter signal framing modulation of anti-interference multimedia mobile broadcast signal framing modulation method of the present invention, as shown in Figure 2, is specifically implemented as follows:
This certain anti-interference Multimedia Mobile broadcast signal transmission machine is by flow through RS coding of the input data bit of oneself, convolutional interleave, serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding, code element modulation and code element rotation, after symbol interleave, on frequency domain, form the cascade interweaved coding modulation data piece of FFT, through IFFT, be transformed to again the discrete cascade interweaving encoding modulating data sample value piece of time domain, by peak-to-average power ratio adjustment unit, generate and to choose the cascade interweaved coding modulation data sample value of the peak-to-average power ratio time domain discrete piece that falls wherein with minimum peak-to-average power ratio and the generate pattern information of the corresponding employing of institute is sent to operational indicator sequence setting unit simultaneously.Serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding and is formed more than being deleted by random interleaving serially concatenated by two convolutional encodings, and the encoding rate that serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
The cascade interweaved coding modulation data piece of FFT is comprised of subcarrier.The length of the cascade interweaved coding modulation data piece of FFT is K; When X gets 512, corresponding K gets 2048, and the frequency interval of corresponding subcarrier is got 4KHz; When X gets 1024, corresponding K gets 4096, and the frequency interval of corresponding subcarrier is got 2KHz; When X gets 2048, corresponding K gets 8192, and the frequency interval of corresponding subcarrier is got 1KHz.
The real part sequence of this certain anti-interference Multimedia Mobile broadcast signal transmission machine using training sequence as sequence of plural training, the imaginary part sequence using operational indicator sequence as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, then it is repeated to form for 4 times continuously time domain embedding training sequence discrete sample block in time domain.The length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and X gets in 512,1024,2048, and the length that time domain embeds training sequence discrete sample block is K, K=4 * X.
Training sequence, operational indicator sequence as anti-interference Multimedia Mobile broadcast signal transmission machine form by a series of 1 or-1, have pseudo-random characteristics, and training sequence, operational indicator sequence have orthogonality each other.The training sequence that meets above-mentioned feature can and be realized as walsh sequence, the Hadamard sequences of orthogonal sequence or the orthogonal sequence being produced by other modes by one group of Phase shift m sequence of a kind of specific type as pseudo-random number sequence.Each different operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference Multimedia Mobile broadcast signal transmission machine.
This certain anti-interference Multimedia Mobile broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame; In the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls in time domain embedding training sequence, insert Cyclic Prefix as protection interval, form signal frame.As protecting the length of the Cyclic Prefix at interval, be C; When X gets 512, corresponding C gets 1/4 of K size; When X gets 1024, corresponding C gets 1/8 of K size; When X gets 2048, corresponding C gets 1/16 of K size.
This certain anti-interference Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to carry out pulse shaping to the signal of signal frame.When X gets 512, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.1; When X gets 1024, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.05; When X gets 2048, the corresponding rolloff-factor that the signal of signal frame is carried out to the square root raised cosine filter of pulse shaping gets 0.025.
By reference to the accompanying drawings specific embodiments of the invention are had been described in detail above, but the present invention is not limited to above-described embodiment, in the spirit and scope situation of claim that does not depart from the application, those skilled in the art can make various modifications or remodeling.
Claims (7)
1. an anti-interference multimedia mobile broadcast signal framing modulation method, is characterized in that it comprises the following steps:
1) anti-interference Multimedia Mobile broadcast signal transmission machine is flowed through the input data bit of oneself after RS coding, convolutional interleave, serially concatenated multi code Rate of Chinese character are deleted remaining convolutional encoding, code element modulation and code element rotation, symbol interleave and on frequency domain, is formed the cascade interweaved coding modulation data piece of FFT, RS represents Reed-Solomon, and the length of the cascade interweaved coding modulation data piece of FFT is K;
2) anti-interference Multimedia Mobile broadcast signal transmission machine adopts IFFT that the cascade interweaved coding modulation data piece of FFT is transformed to the cascade interweaved coding modulation data sample value of time domain discrete piece D
total;
3) anti-interference Multimedia Mobile broadcast signal transmission machine is divided equally into two by the cascade interweaved coding modulation data sample value of time domain discrete piece in order, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1with the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2, D
total=[D
1, D
2];
4) anti-interference Multimedia Mobile broadcast signal transmission machine passes through peak-to-average power ratio adjustment unit to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1, the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
2carry out that signal adds, subtracts, conjugate operation is processed and the synthetic new cascade interweaved coding modulation data sample value of time domain discrete piece D again
new, the cascade interweaved coding modulation data sample value of new time domain discrete piece D
newadopt following generate pattern to obtain, generate pattern 1 is D
new=[D
1, D
2], generate pattern 2 is
generate pattern 3 is
, generate pattern 4 is
Generate pattern 5 is
, generate pattern 6 is
, generate pattern 7 is D
new=[D
* 1, D
2], generate pattern 8 is
, generate pattern 9 is
, generate pattern 10 is
, generate pattern 11 is
Generate pattern 12 is
Compare the 12 kinds of cascade interweaved coding modulation data sample value of time domain discrete piece D that generate pattern is synthetic
new, choose wherein there is minimum peak-to-average power ratio the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece falls
and the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece will fall
the corresponding generate pattern information adopting send to operational indicator sequence setting unit, wherein, D
* 1expression is to the cascade interweaved coding modulation data sample value of time domain discrete sub-block D
1the cascade interweaved coding modulation data sample value of each time domain discrete carry out conjugate operation processing and the cascade interweaved coding modulation data sample value of the time domain discrete sub-block that obtains;
5) the real part sequence of anti-interference Multimedia Mobile broadcast signal transmission machine using training sequence as sequence of plural training, the imaginary part sequence using the set operational indicator sequence of operational indicator sequence setting unit as sequence of plural training, in time domain, form the discrete sample block of sequence of plural training, the length of the discrete sample block of training sequence, operational indicator sequence, sequence of plural training is all X, and operational indicator sequence is comprising and unique each system parameters and business model information of expressing anti-interference Multimedia Mobile broadcast signal transmission machine;
6) anti-interference Multimedia Mobile broadcast signal transmission machine repeats the discrete sample block of the sequence of plural training forming in time domain continuously to form time domain for 4 times and embeds training sequence discrete sample block in time domain, time domain embeds the length and the length numerically equal of falling the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, i.e. K=4 * X of training sequence discrete sample block;
7) anti-interference Multimedia Mobile broadcast signal transmission machine will fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, time domain and embed training sequence discrete sample block and directly superpose and form time domain and embed training sequence and fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece, as frame;
8) anti-interference Multimedia Mobile broadcast signal transmission machine is that frame head inserts time domain and embeds training sequence to fall the cascade interweaved coding modulation data sample value of peak-to-average power ratio time domain discrete piece be frame using Cyclic Prefix as protection interval, to form signal frame, the length of Cyclic Prefix is C;
9) anti-interference Multimedia Mobile broadcast signal transmission machine adopts square root raised cosine filter to be shaped to the signal pulse of signal frame;
10) anti-interference Multimedia Mobile broadcast signal transmission machine by baseband signal up-conversion to carrier wave.
2. by the anti-interference multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that: the length X of the discrete sample block of the training sequence of described anti-interference Multimedia Mobile broadcast signal transmission machine, operational indicator sequence, sequence of plural training is got in 512,1024,2048.
3. by the anti-interference multimedia mobile broadcast signal framing modulation method of claim 2, it is characterized in that: described training sequence, operational indicator sequence form by a series of 1 or-1, have pseudo-random characteristics.
4. by the anti-interference multimedia mobile broadcast signal framing modulation method of claim 2, it is characterized in that: described training sequence, operational indicator sequence have orthogonality each other.
5. by the anti-interference multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that: the cascade interweaved coding modulation data piece of described FFT is comprised of subcarrier; When X gets 512, sub-carrier number gets 2048, and the frequency interval of subcarrier is got 4KHz; When X gets 1024, sub-carrier number gets 4096, and the frequency interval of subcarrier is got 2KHz; When X gets 2048, sub-carrier number gets 8192, and the frequency interval of subcarrier is got 1KHz.
6. by the anti-interference multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that: the length C value of described Cyclic Prefix is relevant with X value; When X gets 512, C gets 1/4 of K size; When X gets 1024, C gets 1/8 of K size; When X gets 2048, C gets 1/16 of K size.
7. by the anti-interference multimedia mobile broadcast signal framing modulation method of claim 1, it is characterized in that: described serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding and formed more than being deleted by random interleaving serially concatenated by two convolutional encodings, and the encoding rate that serially concatenated multi code Rate of Chinese character is deleted remaining convolutional encoding is in 1/4,1/2,5/8,3/4 and 7/8; Code element is modulated to a kind of in QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellations figure mapping mode of code element modulation adopts Gray code mapping; Code element rotation is by rotating to an angle and realize symbol constellations figure, the symbol constellations figure anglec of rotation of QPSK is 22.5 degree, the symbol constellations figure anglec of rotation of 16QAM is 11.25 degree, the symbol constellations figure anglec of rotation of 64QAM is 5.626 degree, and the symbol constellations figure anglec of rotation of 256QAM is 2.8125 degree.
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